01-13-2014, 03:48 PM | #1 |
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How long do people warm up engine before using full engine performance?
I know it's best to let the engine get up to temperature before giving it a bit of welly, just curious as to when people decide this has been reached? Is it time since you started driving, or oil temp? Would it be different in a petrol to a diesel?
I know the M cars have lights that go out as engine warms up to let you know maximum recommended revs, but never had an M car to know how long it takes them. Keen to hear people's views! Thanks |
01-13-2014, 04:03 PM | #4 |
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Depends on application and oil viscosity. Also depends on oil manufacturer, some reach max viscosity at 30deg's these days.
For road applications, once the engine has cranked over you have oil pressure and no metal on metal contact, you can go nuts so to speak. Combustion is helped by higher block temps and you'll get a cleaner burn, hence why closed loop fuelling will be controlled from coolant temp.
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01-13-2014, 04:14 PM | #6 | |
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Just this morning at ~0C, I was almost 9 miles before my oil was reading 80C, even after 11 miles was still only about 87C. In the 535i by that distance oil and coolant are very similar temperatures. So not much "use" of my engine on my typical local trips, they are over before the engine is really ready for some action. HighlandPete |
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01-13-2014, 04:17 PM | #8 |
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01-13-2014, 04:22 PM | #9 | |
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01-13-2014, 04:26 PM | #10 |
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Unscientific, but if you have no oil temp gauge I would say 5 mins in the summer and 10 mins in the winter
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01-13-2014, 04:30 PM | #11 | |
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If you only have a water temp gauge, then wait for 'normal' temp and then a few extra miles. Water temp is normally taken at the engine, so rad could be closed off still at this point. Oil temp lags Water of course. |
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01-13-2014, 04:41 PM | #12 |
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I wouldn't worry, as long as the oil temp has moved off the bottom stop. I fly helicopters for a living, and you quite often give them almost max power when the oil (gearbox and engine) hasn't reached normal operating temp. I know it's not the same, but in it we have a normal operating range for oil temp (and no power limits within). So, in the car, I just wait for mine to be somewhere off the stop.
I have noticed the 2.0D can take an absolute age to get to 100C, so if I was waiting for it to be exactly in the middle, I may be waiting a long time. Sometimes it can take 15 or more miles. |
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01-13-2014, 04:44 PM | #13 | |
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01-13-2014, 04:49 PM | #14 | |
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I'm surprised the N55 is so close during warm up, even from low ambient temps. First 5 or so miles the ECT is about 5C below oil, but by about 10 miles is on par. I know the N55 engine has added oil spray under the pistons for cooling, so that must contribute to the oil heating faster than expected against coolant. HighlandPete |
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01-13-2014, 04:52 PM | #15 |
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01-13-2014, 04:55 PM | #16 |
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One other thing has struck me.... We don't worry (or even know) about the transmission oil temp in our cars (unless you have an OBD connector), but we will still ask almost max torque out of it happily regardless of its temp! I wouldn't be too worried about either. Just don't whip the car when it's properly cold :-)
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01-13-2014, 05:01 PM | #17 |
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01-13-2014, 05:03 PM | #19 |
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01-13-2014, 06:18 PM | #20 |
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What's full performance?
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